SVERIGES LANTBRUKSUNIVERSITET - Epsilon Open Archive - SLU

During the latest years porometers which combine measurements of both
stornatal resistance and photosynthesis have become commercially available
(e.g. "LI 6200 Portable Photosynthesis System", LiCor Inc., Lincoln 68504,
Nebraska, USA; "C0 2 - H 2 0 - Porometer" Heinz Walz, Mess- und
Regeltechnik, D - 8521 Effeltrich, West Germany; "Field Analysing System",
ADC Ltd. Haddesdon, Herts. ENllOAQ, England). In these CO 2 and
H 2 0 porometers the CO 2 assimilation determination is based on infrared
gas analysis. They also have the facilities to register light intensity, humidity
and temperature. Information on theory, calibration and use of porometers
are given elsewhere (e.g. Schultze et al., 1982; Jones, 1983; Beadle et al.,
1985; Bannister, 1986).
REFERENCES
Andersen, M. 1985 Drought resistance, root development and soil water supply on sandy
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Bannister, P. 1986 Water relations and Stress. In: Methods in Plant Ecology, 2nd ed. Eds:
P.D. Moore and S.E. Chapman. pp 73-143. BlackweIl Sci. Publ., Oxford.
Barrs, H.D. and Weatherley, P .E. 1962 A re - examination of the relative turgidity technique
for estimating water deficits in leaves. Aust. J. Biol. Sci. 15,413-28.
Beadle, c.L., Ludlow, M.M. and Honeysett, J.L. 1985 Water relations. In: Techniques in
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Bradford, K.J. and Hsiao, T.C. 1982 Physiological responses to moderate water stress. In:
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263-324. Springer Verlag, Berlin, Heidelberg, New York.
Burquez, A 1987 Leaf thickness and water deficit in plants: A tool for field studies. J. Exp.
Bot. 38, 109-14.
Campbell, G.S. and Campbell, M.D. 1974 Evaluation of a thermocouple hygrometer for
measuring leaf water potential in situ. Agron. J. 66, 24-7.
Cowan, I.R. 1965 Transport of water in the soil-plant - atmosphere system. J. Appl. Ecol.
2,211-39.
Faiz, S.MA. and Weatherley, P.E. 1977 The location of the resistance to water movement
in the soil supplying the roots of transpiring plants. New Phytol. 78, 337 - 47.
Faiz, S.MA. and Weatherley, P.E. 1978 Further investigations into the location and
magnitude of the hydraulic resistances in the so il plant system. New Phytol. 81, 19-28.
Faiz, S.MA. and Weatherley, P.E. 1982 Root contraction in transpiring plants. New Phytol.
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Gardner, W.R. 1960 Dynamie aspects of water availability to plants. Soil Sci. 89, 63-73.
Hanks, RJ. and Nimah, M.N. 1988 Integrating and applying soil and plant water status
measurements. Irrig. Sci. 9, 319-28.
Hanson, AD. 1982 Metabolic responces of mesophytes to plant water deficits. Ann. Rev.
Plant. Physiol. 33, 163 - 203.
HelIkvist, R, Richards, G.P. and Jarvis P.G. 1974 Vertical gradients of water potential and
tissue water relations in Sitka spuce trees measured with the pressure chamber. J. Appl.
Ecol. 11,637-67.
Henson, LE., Jensen, c.R. and Turner, N.C. 1989 Leaf gas exchange and water relations of
lupins and wheat. I. Shoot responses to soil water deficits. Aust. J. Plant Physiol. 16 (In
print).
Herkelrath, W.N., Miller, E.E. and Gardner, W.R. 1977 Water uptake by plants: II. The root
contact model. Soil Sci. Soc. Am. J. 41, 1039-43.
Hillel, D. 1980 Applications of soil physics. Acad. Press, New York.
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